Fix various errors found with UBSan#8184

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damyanp wants to merge 8 commits intomicrosoft:mainfrom

Commits on Feb 20, 2026

Fix UB: initialize SpirvCodeGenOptions members

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Fix UB: initialize FrontendInputFile::IsSystem in default ctor

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Fix UB: avoid left shift of negative value in APInt::slt

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Fix UB: initialize vfs::Status members in default ctor

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Fix UB: initialize LookupResult::Ambiguity member

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Fix UB: initialize Triple::SubArch member

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Fix UB: guard memcpy against null pointer in MemoryBuffer

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chore: autopublish 2026-02-20T17:43:20Z
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